کانی‌شناسی و کانی‌شیمی بیگانه سنگ‌های دیوریت-گابرویی سنگ‌های آتشفشانی منطقه‌ی منور (تبریز)، شمال غرب ایران

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم زمین، دانشکده علوم طبیعی، دانشگاه تبریز ، تبریز، ایران

2 گروه باستان سنجی و علوم طبیعی، پژوهشکده حفاظت و مرمت آثار تاریخی-فرهنگی، پژوهشگاه میراث فرهنگی و گردشگری، تهران، ایران

3 دانشگاه پیام نور، تهران، ایران.

چکیده

منطقه مورد بررسی در شمال­غرب ایران و در پهنه البرز غربی _ آذربایجان قرار دارد. سنگ­های میزبان بیگانه سنگ­های مورد بررسی از نوع آندزیت بازالتی و آندزیت هستند. بیگانه سنگ­های موجود در سنگ­های آتشفشانی شامل انواع گابرویی و دیوریتی هستند. کانی­های اصلی تشکیل­دهنده بیگانه سنگ­ها شامل پلاژیوکلاز، آمفیبول و کلینوپیروکسن و کانی­های فرعی بیوتیت، ارتوپیروکسن  و کانی­های تیره هستند. بافت غالب بیگانه سنگ­ها دانه­ای و ریزسنگی پورفیری است. براساس شیمی کانی، ترکیب پلاژیوکلاز، آمفیبول، پیروکسن و بیوتیت به ترتیب عبارتند از الیگوکلاز تا آندزین، چرماکیت تا هورنبلند، اوژیت و استونیت. آمفیبول­های بیگانه سنگ­ها بر پایه مقدار AlIV (کمتر از ۵/۱ درصد)، در قلمرو کرانه­ی فعال قاره­ای وابسته به فرورانش قرار دارند. دما-فشارسنجی بیگانه سنگ­ها  با استفاده از مقدار کاتیونی آلومینیوم کل، نشان دهنده فشار 6/۰±5.8 کیلوبار و دمای حدود ۸۰2 درجه­ی سانتیگراد در محیط تبلور است. کلینوپیروکسن­های مورد بررسی با ترکیب نیمه قلیایی همخوانی خوبی با محیط زمین­ساختی کمان ماگمایی دارند. همچنین کلینوپیروکسن­ها در فشارهای کم تا متوسط تشکیل شده­اند که بیانگر تبلور آنها طی صعود ماگما و در اعماق متفاوت است. مقدار آهن سه ظرفیتی در کلینوپیروکسن­ها نشان­دهنده گریزندگی بالای اکسیژن ماگماست. کلینوپیروکسن­های بیگانه سنگ­های دیوریت-گابرویی در فشار 12 کیلوبار و دمای حدود 1050 درجه سانتیگراد تشکیل شده­اند.     

کلیدواژه‌ها

عنوان مقاله [English]

Mineral chemistry of gabbro- dioritic xenoliths in Monavvar volcanic rocks (Northwest of Tabriz- NW Iran)

نویسندگان [English]

  • Afsoun Akhshani 1
  • Mohsen Moayyed 1
  • Nasir Amel 1
  • Amin Allah Kamali 2
  • Mohammad Fadaeian 3
1 Department of Geology, University of Tabriz, Tabriz 51664, Iran
2 Research institute of Cultural Heritage & Tourism
3 Department of Geology, Payame Noor University, Tehran, Iran
چکیده [English]

The studied area is located in the northwest of Iran within the western Alborz- Azerbaijan zone. The host rocks of the studied xenoliths are basaltic andesite and andesite. Xenoliths in volcanic rocks include gabbroic and diorite xenoliths. The main minerals of xenoliths include plagioclase, amphibole and clinopyroxene with minor minerals including biotite, orthopyroxene and opaque minerals. The main texture of xenoliths is granular and microlithic porphyric. Based on mineral chemistry, the composition of plagioclase, amphibole, pyroxene and biotite is oligoclase to andesine, chermakite to hornblende, augite and stonite respectively. Based on AlIV value (less than 1.5), amphiboles of xenoliths are placed in the active subduction-related continental margin. The thermo-barometric measurement of xenoliths, using the amount of total aluminum cations, indicates a pressure of 5.8 ± 0.6 kbar and a temperature of about 802°C in the crystallization environment. The studied clinopyroxenes with sub-alkaline composition show good compatibility with magmatic arc tectonic environment. Also, clinopyroxenes are formed in low to medium pressures, which indicates their crystallization during magma ascent at different depths. The amount of ferric iron in clinopyroxenes indicates the high fugacity of oxygen magma. The clinopyroxenes of diorite-gabbroic xenoliths were formed at a pressure of 12 kilobars and a temperature of about 1050°C.

کلیدواژه‌ها [English]

  • xenolith
  • diorite-gabbro
  • Mineral chemistry
  • Manavvar

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  • تاریخ دریافت: 02 اسفند 1401
  • تاریخ بازنگری: 16 اردیبهشت 1402
  • تاریخ پذیرش: 01 خرداد 1402

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